Exploring the Synthesis and Multifunctional
Properties of Sr2NiMoO6 Double Perovskite
Chinthu Sukumar*, P. Neenu Lekshmi and Manoj Raama Varma
Materials Science and Technology Division, National Institute for Interdisciplinary Science and Technology, CSIR,
Trivandrum -695 019, India.
*Email: chinthusukumar@gmail.com, Tel.: +91-9400403784
Abstract
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Multifunctional materials show various
responses to multiple external stimuli enabling novel
device applications including intelligent sensors,
spintronics, solid-state thermoelectric coolers, and other
functional devices. In the search for multifunctional
materials the so-called double perovskites, display a
wide variety of interesting physical properties with
composition variations. These materials have attracted
renewed interest due to the fact that they combine high
Curie-temperatures
and
half-metallicity
(Eg:
Sr2FeMoO6,
Sr2CrWO6
and
Sr2FeReO6
etc).
Molybdenum based double perovskites have received
significant research interest due to their potential
applications in various fields. Sr2FeMoO6 having Curie
temperature above room temperature and significant
low-field magneto-resistance at room temperature has
triggered the investigation of other double perovskites
that could show similar or improved properties.
Recently, the attention has been focused on novel
double perovskites, such as Sr2MnMoO6 and
Sr2NiMoO6, which have been shown to possess
multiferroic
properties.
The
nickel
analogue
Sr2NiMoO6 has attracted our attention. The present
investigation focuses on the synthesis, detailed
characterisation of the structure, magnetic and transport
properties of Sr2NiMoO6 double perovskite.
We have synthesized phase pure Sr2NiMoO6
through a precursor route [1]. NiMoO4 precursor helps
to stabilize the phase structure of Sr2NiMoO6 ceramics
from the possible secondary phase, such as SrMoO4 or
SrNiO3 or Sr2Ni2O5 [2]. The Sr2NiMoO6 was
characterized by XRD, showed that single-phase cubic
perovskite structure was formed when calcined at
1300°C in air followed by sintering at 1400°C for 2 hrs.
The phase purity of the sample was confirmed by XRD
800
(111)
Keywords: Double perovskites, Multiferroics, Spintronics,
Magnetic, Dielectric.
(fig.1). Rietveld refinement of the X -ray diffraction
pattern and the surface morphology studies were
performed on the synthesized powder (fig.2).
Intensity(a.u.)
The double perovskite Sr2NiMoO6 powder was prepared
by precursor solid-state reaction method in air. The
structure, magnetic and transport properties of
Sr2NiMoO6 double perovskites have been investigated. At
room temperature, Sr2NiMoO6 have crystallized into pure
cubic phase with space group Fm-3m. They exhibit
multifunctional behaviors, which make them attractive
candidates for spintronic applications.
80
90
2 (deg)
Fig. 1: XRD of Sr2NiMoO6
Fig. 2: SEM image of Sr2NiMoO6
The detailed physical characterization such as
magnetic, dielectric and dc transport studies along with
possible mechanisms responsible for the transport
behavior of Sr2NiMoO6 will be presented.
Acknowledgment
NIIST, Council of Scientific and Industrial Research.
References
[1] N.A. Hill, Annu. Rev. Mater. 32 (2002), 1
[2] M.W. Lufaso, R.B.Macquart, Y. Lee, T. Vogt, H.C.
Loye, J. Phys.,Condens. Matter 18 (2006), 8761